package cn.edu.scau.cmi.dengzejun.chapter04;

public class E {
	public static void main(String agr[]) {
		char c='\0';
		for (int i=1;i<=4;i++) {
			switch (i) {
			case 1: c='a';
					System.out.print(c);
			case 2:c='b';
					System.out.print(c);
			case 3:c='c';
					System.out.print(c);
					
			default: System.out.print("!");
			}
		}
	}
}
